When it comes to really bad fork legs , check for the replacement options , since grinding and chroming have gone up considerable in the last few months. In general staightening will cost about $20.00 per leg .
If there are creases , we will not touch them for safety reasons and you will also find that the spring will be obstructed due to the creasing . I know of places in USA that will have new legs for $150.00 and for that amount you are better off with new ones.